gen_test.py 文件源码

def test_no_ref(self):
        # In this usage, there is no direct hard reference to the
        # WaitIterator itself, only the Future it returns. Since
        # WaitIterator uses weak references internally to improve GC
        # performance, this used to cause problems.
        yield gen.with_timeout(datetime.timedelta(seconds=0.1),
                               gen.WaitIterator(gen.sleep(0)).next())